Smoke-consuming furnace



2 Sheets-Sheet 1.

(No Model;)

B. L. WALKER. SMOKE OONSUMING FURNAGB.

No..479,100. Patented July 19, 1892.

we now: runs cm, PHOTO-WING. WASHINBYDN, n c

(No Model.) 2 Sheets-Sheet 2.

R. L. WALKER. SMOKE OONSUMING FURNACE.

Nd-479,100. Patented Ju1 19.1892.

UNITED STATES PATENT @FFICE.

ROBERT L. WALKER, OF BOSTON, MASSACHUSETTS.

SMOKE-CONVSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 479,160, dated July 19, 1892.

Application filed November 18, 1891. Serial No. 412,292. (No model.) Patented in England March 4, 1890I No. 3,487: in France March 10, 1890, No. 204,227; in Belgium March 10, 1890.1l0. 89,781, and in Germany March 14, 1890, No. 53,998.

T on whom it may concern.-

Be it known that 1, ROBERT LOUDON WALKER, of Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Smoke-Consuming Furnaces, (for which I obtained, March 4:, A. D. 1890, British Patent No. 3,487 March 10, A. D. 1890, French Patent No. 204,227 and Belgian Patent No. 89,781, and March 14C,A.D. 1890, Gerro man Patent No. 53,998,) of which invention the followingis a specification, reference being had to the accompanying drawings, makinga part hereof, in which- Figure 1 is a front elevation (with some of r 5 the parts omitted for greater clearness) illustrating one form of apparatus. Fig. 2 is a longitudinal vertical section. Fig. 3 is a partial View in section on line 3 3 of Fig. 2. Fig. 4 is a partial view in section on line 4 4 of Fig. 2, and Fig. 5 a partial view in section on line 5 5 of Fig. 2. Figs. 6 and 7 are views illustrating my new construction of a doorframe, Fig. 6 being a sectional view on line 6 6 of Fig. 2 and Fig. 7 an elevation, partly in section, of the metal ring which constitutes the door-frame.

' My invention relates to a furnace with a fire-box which is divided horizontally into two portions, and its lower portion also divided by an upright partition into two portions, with a damper which forms a cover first to one lower portion of the divided fire.- box and then to the other lower portion, and its main feature is the practical provision for 3 5 the circulation of water through the sides of the two lower portions of the fire-box and through the damper.

In the drawings the outer water-legs A A form the sides of the fire-box, and the lower part of the fire-box is divided into two portions by the water-leg A The fire-box is also divided horizontally into two portions by the fire-brick arches B B and the damper D, so that the products of combustion from the fuel 5 in one part of the divided fire-box may be compelled to pass around the inner end of the middle leg A and under the arch of the other part and over the incandescent fuel of the \other part of the fire-box in order to get to the upper part of the fire-box and thence through fines or tubes, for, as will be clear,

my invention is applicable in all cases where a fire-box is divided into two parts by a horizontal partition, of which a water-damper forms a part, and the lower part is also divided into two parts, so that the sides of each part are supplied'with water. It is essential for the proper working of a fire-box thus divided into three parts with a water-damper and water sides that the circulation of water he beproperly maintained in the damper andin the sides, and this is especially difficult in the damper and in the inner water-leg A which forms the sides of both the lower parts of the fire-box. The damper D has a Water-channel at through it from end to end, and this channel connects at one end with a pipe D, which opens into the upper part of the boiler and at the other end with a pipe D which opens into the lower part of the boiler. The water-leg A which forms the sides of both the lower portions of the fire-box, also furnishes a support for the damper D, and this water-leg A is kept supplied with water by connecting it with the boiler at both ends and also at its upper edge. The end connections in the locomotive type of boiler shown in the drawings are the holes aand the tubes at and the edge connection is the pipe (1, and also one or more brace-pipes a It is this combination of the damper D and water-leg A with the fire-box and boiler by connections which insure a proper circulation in each that constitues the main feature of my invention, for heretofore all smoke-consuming furnaces on this plan have proved defective in practical use; and I have discovered that these defects are remedied by keeping the connection G between the inner end of the damper D and the water-leg A from destruction by 0 an excess of heat, and that this can be done by insuring such a circulation of water through the damper D and through the wator-leg A as to keep the saddle G from becoming excessively hot. As an additional 5 precaution, the saddle G is formed as a double conduit, the inner tubular part 9 serving as a prolongation of the channel d of damper D and the outer annular part 9' serving as a connection between the upper edge of the wa- I00 ter-leg A and the pipe (L The main feature of my invention, as has been said,is keeping the circulation active in the damper D and water-leg A so that the upper edge of waterleg A will serve as a practical support for the damper D; but this additional feature of the double way through the saddle G is also a feature of my invention, for while the main feature may be embodied with a saddle which has but one water-way through it, (the way g connecting with the damper-channel (1,) it is much more perfectly embodied with a saddle having the two water-ways g g. The main novelty of my new combination is the provision for keeping the upper edge of the water- 'leg A from overheating; but as the main reason for doing this is to make the upper edge of the leg A a practical support for the damper D, the full and complete novelty is the provision for keeping the upper edge of the leg A from overheating, coupled with the double water-channel for keeping the saddle G from overheating. ThedamperD isjointed at each end by a ground joint and is forced against the saddle G by spring H.

The segment-gear J is fast to the damper and is actuated by rack j, which is actuated by the piston-rod of the cylinder j to which steam is admitted through one of the pipesj j, one of these pipes connecting with the exhaust when the other connects with steamspace in the boiler through any suitable valve 3 whose construction is too well known to require description. The arm j is also fast to the damper and is connected to the bufferspring II by the chain h, which is properly guided, as indicated in the drawings, to ease the opening and check the closing of the damper. The tubes at of the water-leg A are preferably corrugated for some portion of their length to favor the expansion and contraction. Thehollow screws S are bored as a snug fit for their pipes, and when screwed in place they are slightly compressed and very slightly contracted in diameter, thereby making a steam-tight joint. The brace-pipes a are also secured by screws 8, and aid in getting a proper circulation through the waterleg A but in practice I have found it desirable to omit one of these pipes a, as in some cases it is found inconvenient to use both these pipes.

These and many other details of construction not described will be understood by all skilled in the art.

The door-frame of the fire-box consists in a ring of iron of a proper quality with two shoulders r r turned upon it, one near each end, the thicker portion R of the ring extending between the plates 1) p of the boiler and the thinner portions 0" r extending through the plates 1) p, and being riveted on the outside of each plate. This forms a simple, very durable, and efficient frame, which is steam-tight and can be readily made as desired.

A furnace similar in general construction to that herein set forth is described in Patent No. 293,544, granted me February 12, 1884:.

The present invention embraces an improved construction hereinafter pointed out whereby a more efficient circulation of water through the damper, water-leg, and saddle is secured.

\Vhat I claim as my invention is-- 1. In a fire-box divided horizontally by a fire-brick partition B B and water-damper D and longitudinally by the water-leg A", the damper D, having a channel cl through it which connects at one end with the upper part of the boiler and at the other end with the lower part of the boiler, and the waterleg A which connects at both ends and also at its upper edge with the boiler, the waterleg A serving as support for the damper D, all substantially as described.

2. In combination with the water-damper D and water-leg A the saddle G, having the Water-ways g g, substantially as and for the purposes specified.

ROBERT L. \VALKER.

Vitnesses:

J. E. MAYNADIER, JOHN R. Snow. 

